Late last year the conventional wisdom on economic policy took a hard right turn. Even though the world’s major economies had barely begun to recover, even though unemployment remained disastrously high across much of America and Europe, creating jobs was no longer on the agenda. Instead, we were told, governments had to turn all their attention to reducing budget deficits.

Skeptics pointed out that slashing spending in a depressed economy does little to improve long-run budget prospects, and may actually make them worse by depressing economic growth. But the apostles of austerity — sometimes referred to as “austerians” — brushed aside all attempts to do the math. Never mind the numbers, they declared: immediate spending cuts were needed to ward off the “bond vigilantes,” investors who would pull the plug on spendthrift governments, driving up their borrowing costs and precipitating a crisis. Look at Greece, they said.

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This was a strange argument even a few months ago, when the U.S. government could borrow for 10 years at less than 4 percent interest. We were being told that it was necessary to give up on job creation, to inflict suffering on millions of workers, in order to satisfy demands that investors were not, in fact, actually making, but which austerians claimed they would make in the future.

But the argument has become even stranger recently, as it has become clear that investors aren’t worried about deficits; they’re worried about stagnation and deflation. And they’ve been signaling that concern by driving interest rates on the debt of major economies lower, not higher. On Thursday, the rate on 10-year U.S. bonds was only 2.58 percent.

So how do austerians deal with the reality of interest rates that are plunging, not soaring? The latest fashion is to declare that there’s a bubble in the bond market: investors aren’t really concerned about economic weakness; they’re just getting carried away. It’s hard to convey the sheer audacity of this argument: first we were told that we must ignore economic fundamentals and instead obey the dictates of financial markets; now we’re being told to ignore what those markets are actually saying because they’re confused.